Update dependencies, elixir version, and adjust for usage behind Cloudflare#8

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sascha-wolf wants to merge 7 commits intomainfrom

improvement/upgrade-deps-and-elixir

Commits on Sep 7, 2023

:construction_worker: Replace CircleCI with GitHub actions
Sascha Wolf
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:memo: README: Update badges and fix some warnings
Sascha Wolf
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:memo: CHANGELOG: Update to conform to the usual format
Sascha Wolf
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:arrow_up: deps: Upgrade all dependencies
Sascha Wolf
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:wrench: mix: Adjust version detection and publish instructions
Sascha Wolf
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:fire: version: Remove the file from version control
Sascha Wolf
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:pushpin: elixir: Bump required version to 1.7.4
Sascha Wolf
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